A salesman who marketed illegal cancer treatments in the U.S. for a Canadian company embroiled in a counterfeit-drug scandal is scheduled to plead guilty on Wednesday to a federal charge of covering up a felony committed by his associates, according to court documents. In a filing late last week in federal court in Butte, Mont., the U.S. attorney's office in Montana said Paul Bottomley, who worked on contract for a subsidiary of Winnipeg-based Canada Drugs until last year, has reached a plea agreement and will plead guilty to a charge of "misprision of a felony," or the covering up of a felony. In the documents, the Montana U.S. attorney's office says Mr. Bottomley knew that Canada Drugs was violating federal law by shipping illegal medicines to the U.S. but failed to notify authorities of the crime. Mr. Bottomley's lawyer didn't immediately return a phone call seeking comment. Canada Drugs didn't respond to email or phone messages seeking comment. Canada Drugs, an Internet pharmacy and drug wholesaler, came under pressure last year after distributing counterfeit vials of the blockbuster cancer drug Avastin to U.S. doctors. Canada Drugs employees have acknowledged shipping the vials but say they didn't know the drugs were counterfeit.